Calculation and comparison of the noise and latency of RTK observations using radio link and NTRIP

Penman, Brian (2011) Calculation and comparison of the noise and latency of RTK observations using radio link and NTRIP. [USQ Project]

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Abstract

In 2004, the application known as Networked Transport of RTCM via Internet Protocol (NTRIP) was developed to transmit Global Navigation Satellite System (GNSS)corrections for the purpose of performing Real Time Kinematic (RTK) surveys. NTRIP utilises the Internet Protocol (IP) thus eliminating line of sight problems associated with Radio Link caused by obstructions such as buildings and mountains.

Early use of NTRIP indicated that latency (time lag) of correction data was a problem as well as the positional uncertainty with respect to setting out points. Radio Link data (the conventional method of data transmission for RTK) has provided quality data for Global Positioning System (GPS) surveys for many years and provides the benchmark for a series of tests on NTRIP data. These tests will measure the noise and latency of NTRIP and Radio Link data.

Testing noise involved taking thirty static measurements to assess the horizontal precision of the data which can be directly related to signal noise. Testing latency involved driving a vehicle at a constant speed past a specific starting point. As the vehicle passed the starting point the measure button was pressed and a point was stored some distance past the starting point. This distance from the starting point to the stored point reflects latency
in the signal.

The results found that signal noise has minimal affect on NTRIP data and the IP path in which the data is transmitted, thus horizontal precisions easily meet survey standards at the range of nine kilometres. The results from the driving test have demonstrated that latency of GNSS corrections using NTRIP have improved from early experiments carried out and are now in line with the latency times of Radio Link data.

The benefits of these findings will allow the surveying industry to use NTRIP with confidence knowing that latency times are minimal and that horizontal precisions meet
survey standards and at nine kilometres are equal to that of Radio Link.


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Item Type: USQ Project
Refereed: No
Item Status: Live Archive
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Surveying and Land Information
Supervisors: Gibbings, Peter
Date Deposited: 07 Jan 2013 03:08
Last Modified: 03 Jul 2013 01:37
Uncontrolled Keywords: radio links, RTK observation, NTRIP
Fields of Research : 09 Engineering > 0909 Geomatic Engineering > 090903 Geospatial Information Systems
URI: http://eprints.usq.edu.au/id/eprint/22624

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